Longman Dictionary of Contemporary English homepage

Topic: PSYCHOLOGY, PSYCHIATRY

Date: 1800-1900
Language: Greek
Origin: 'mental illness', from para- ( PARA-) + nous 'mind'

paranoia

noun
     
par‧a‧noi‧a [uncountable]
1 an unreasonable belief that you cannot trust other people, or that they are trying to harm you or have a bad opinion of you
2 medicalMP a mental illness that makes someone believe that they are very important and that people hate them and are trying to harm them
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